Is Russia's invasion of Ukraine justified?

No, Russia's full-scale invasion of Ukraine (launched on 24 February 2022, following the 2014 annexation of Crimea and conflict in Donbas) is not justified under international law, the UN Charter, or mainstream applications of just war theory. It is widely regarded as an act of aggression and a clear violation of Ukraine’s sovereignty and territorial integrity. While Russia has advanced various political, historical, and security rationales, these have been rejected by the vast majority of states, legal experts, and international bodies as pretextual, unsubstantiated, or legally insufficient.[1]

Russia’s Stated Justifications

Russian President Vladimir Putin and officials have cited several overlapping reasons:

•“Denazification,” demilitarization, and protection from “genocide”: Claims that Ukraine’s government (post-2014 Euromaidan) is a “Nazi”/fascist junta committing genocide or humiliation against ethnic Russians and Russian-speakers, especially in Donbas since 2014. The operation aims to “protect people who... have been facing humiliation and genocide” and to demilitarize/denazify.[2]

•Self-defense (including collective) and NATO expansion: Invoking UN Charter Article 51. Russia recognized the self-proclaimed Donetsk and Luhansk “People’s Republics” days before the invasion and claimed to act in their defense against Ukrainian “aggression.” Broader claims frame it as defensive against NATO “encirclement,” broken (informal) promises not to expand eastward, and potential Ukrainian weapons threats.[3]

•Historical/identity claims: Ukrainians and Russians are “one people”; Ukraine lacks authentic statehood (portrayed as a Bolshevik/Leninist artificial creation or “Little Russia”); the goal is restoring historical unity or Russian lands and preventing a Western-oriented Ukraine.[4]

•Other elements include regime change in Kyiv, countering Western “values,” and sphere-of-influence concerns.

These narratives mix security dilemma arguments (realist IR views that great powers react to nearby rival alignments), imperial/revanchist ideology, and domestic legitimation. Some analysts (including certain realists) argue NATO enlargement and Western policies contributed to Russian threat perceptions or that the war reflects imperial strategic culture aiming to weaken a rising Ukraine.[5]

Why These Do Not Justify the Invasion

Legal assessment under international law:

•The UN Charter (Article 2(4)) prohibits the threat or use of force against the territorial integrity or political independence of any state. The only exceptions are self-defense against an armed attack (Art. 51) or UN Security Council authorization. Russia’s actions match none of these.[1]

•No armed attack by Ukraine on Russia occurred. The DPR/LPR lack widespread recognition as states (widely seen as Russian-backed entities) and do not qualify for collective self-defense. Claims of “anticipatory” self-defense or imminent threat fail—Ukraine posed no such military danger (its forces were far smaller; it had denuclearized). Humanitarian intervention/R2P or “protection of nationals” doctrines (even if accepted, which is contested) require evidence of genuine, large-scale atrocities meeting high thresholds and proportionate response; none exists here.[1]

•It constitutes a crime of aggression under international criminal law (Rome Statute definition: a manifest violation of the Charter by character, gravity, and scale).[1]

•Russia violated prior commitments: the 1994 Budapest Memorandum (Russia, US, UK pledged to respect Ukraine’s independence, sovereignty, and existing borders in exchange for Ukraine giving up Soviet-era nuclear weapons); the Helsinki Final Act; the 1997 Russia-Ukraine Friendship Treaty; and Minsk agreements.[6]

•UN General Assembly resolutions have repeatedly and overwhelmingly condemned the invasion as aggression, demanded withdrawal, and reaffirmed Ukraine’s territorial integrity (e.g., initial ~141-5 vote; subsequent majorities continue to support Ukraine’s position despite some shifts in abstentions). The Security Council was blocked by Russia’s veto.[7]

•The International Court of Justice (ICJ) has jurisdiction in the related Genocide Convention case (Ukraine v. Russia). It has found it can hear Ukraine’s claim that there is no credible evidence Ukraine committed genocide in Donbas (the pretext Russia used), and proceedings continue (including on Russian counter-claims).[8]

Factual rebuttals to key claims:

•Genocide/Nazism: No credible evidence of genocide. The Donbas conflict (2014–2022) caused thousands of deaths (both sides, including civilians), but not the intent/destruction of a group required legally. Ukraine’s president is Jewish with Holocaust-survivor family history; far-right parties have negligible electoral support (~2%). Independent investigations and bodies have not substantiated Russian claims; they are widely called baseless propaganda.[9]

•NATO: A defensive alliance; membership is voluntary and was not imminent for Ukraine in 2022. Post-invasion accessions by Finland and Sweden (without Russian attack) undercut the “encirclement forces invasion” logic. Informal 1990s discussions on NATO did not constitute a binding treaty prohibiting enlargement.

•History and identity: Ukraine has a distinct language, culture, and history of statehood predating the USSR (Kyivan Rus’ roots are shared/contested, but modern Ukraine’s independence was recognized by Russia in 1991 and after). Denying its nationhood is a form of irredentism rejected under modern international norms of self-determination and uti possidetis (borders at independence).

•Comparisons to Western interventions (e.g., Kosovo, Iraq) do not legalize another violation—“two wrongs don’t make a right.”

Just war theory (jus ad bellum): Russia’s war fails core criteria—just cause (aggression for conquest/domination/sphere of influence is unjust), right intention, last resort, proportionality, and reasonable chance of success without excessive harm. Ukraine’s defensive war meets them. Virtually all uses of force by Russian forces in pursuit of these aims are impermissible.[10]

Broader Context and Consequences

The invasion has caused massive human suffering, displacement, documented war crimes/crimes against humanity allegations (investigated by ICC and others), economic disruption, and challenges to the post-WWII order. Motives appear to include preventing a successful, Western-aligned democratic Ukraine (as a potential model or rival), securing strategic depth/Black Sea access (Crimea), and Putin's long-standing views on Russian-Ukrainian “unity.” Security concerns about NATO are real in Russian strategic culture but do not authorize preventive conquest of a neighbor.[11]

Explanations (e.g., great-power politics, miscalculation that it would be quick) differ from justifications. The international community’s response—sanctions, military/economic aid to Ukraine, isolation of Russia—reflects the consensus against it, though enforcement is imperfect due to geopolitics (vetoes, nuclear risks, Global South neutrality/abstentions).

In short, while grievances, historical narratives, and security dilemmas can be debated as explanations, they do not make the unprovoked invasion of a sovereign state justified. Ukraine has the right to self-defense; Russia does not have a right to dictate its neighbor’s alliances, identity, or government by force. Peace requires Russian withdrawal and respect for internationally recognized borders, consistent with the UN Charter.

Citations (11)

1wikipedia.orgEncyclopedias and referencequality 0.83
https://en.wikipedia.org/wiki/Legality_of_the_Russian_invasion_of_Ukraine
Backs: “While Russia has advanced various political, historical, and security rationales, these have been rejected by the vast majority of states, legal experts, and international bodies as pretextual, unsubstantiated, or legally insufficient.”
2themoscowtimes.comNews and mediaquality 0.79
https://www.themoscowtimes.com/2026/01/30/dont-forget-the-many-ways-russia-tried-to-justify-invading-ukraine-a91825
Backs: “The operation aims to “protect people who... have been facing humiliation and genocide” and to demilitarize/denazify.”
3springer.comAcademic
https://link.springer.com/article/10.1007/s40802-024-00260-w
Backs: “Russia recognized the self-proclaimed Donetsk and Luhansk “People’s Republics” days before the invasion and claimed to act in their defense against Ukrainian “aggression.” Broader claims frame it as defensive against NATO “encirclement,” broken (informal) promises not to expand eastward, and potential Ukrainian…”
4atlanticcouncil.orgNonprofits and think tanks
https://www.atlanticcouncil.org/content-series/russia-tomorrow/narrating-the-war-analyzing-russias-narratives-for-its-invasion-of-ukraine/
Backs: “Ukraine lacks authentic statehood (portrayed as a Bolshevik/Leninist artificial creation or “Little Russia”); the goal is restoring historical unity or Russian lands and preventing a Western-oriented Ukraine.”
5internationalaffairs.org.auNonprofits and think tanks
https://www.internationalaffairs.org.au/australianoutlook/why-nato-expansion-explains-russias-actions-in-ukraine/
Backs: “Some analysts (including certain realists) argue NATO enlargement and Western policies contributed to Russian threat perceptions or that the war reflects imperial strategic culture aiming to weaken a rising Ukraine.”
6stanford.eduAcademic
https://cisac.fsi.stanford.edu/news/budapest-memorandum-myths
Backs: “Russia violated prior commitments: the 1994 Budapest Memorandum (Russia, US, UK pledged to respect Ukraine’s independence, sovereignty, and existing borders in exchange for Ukraine giving up Soviet-era nuclear weapons); the Helsinki Final Act; the 1997 Russia-Ukraine Friendship Treaty; and Minsk agreements.”
7un.orgGovernment
https://news.un.org/en/story/2025/02/1160456
Backs: “UN General Assembly resolutions have repeatedly and overwhelmingly condemned the invasion as aggression, demanded withdrawal, and reaffirmed Ukraine’s territorial integrity (e.g., initial ~141-5 vote; subsequent majorities continue to support Ukraine’s position despite some shifts in abstentions). The Security Council…”
8icj-cij.orgGovernment
https://www.icj-cij.org/node/203516
Backs: “It has found it can hear Ukraine’s claim that there is no credible evidence Ukraine committed genocide in Donbas (the pretext Russia used), and proceedings continue (including on Russian counter-claims).”
9gov.ukGovernment
https://www.gov.uk/government/speeches/russias-war-in-ukraine-has-been-built-on-a-foundation-of-falsehoods
Backs: “Independent investigations and bodies have not substantiated Russian claims; they are widely called baseless propaganda.”
10ut.eeNot yet classified
https://filsem.ut.ee/et/sisu/just-war-theory-and-russia-ukraine-war-jeff-mcmahan
Backs: “Virtually all uses of force by Russian forces in pursuit of these aims are impermissible.”
11rusi.orgNonprofits and think tanks
https://rusi.org/explore-our-research/publications/commentary/ukraine-russian-imperial-action-challenges-and-policy-options
Backs: “Motives appear to include preventing a successful, Western-aligned democratic Ukraine (as a potential model or rival), securing strategic depth/Black Sea access (Crimea), and Putin's long-standing views on Russian-Ukrainian “unity.” Security concerns about NATO are real in Russian strategic culture but do not…”